Burner and aftertreating device of exhaust gas

ABSTRACT

Provided are a burner and an aftertreating device of exhaust gas, which employs a simple construction using the flame protection tube, thereby increasing stability in forming the flame without the loss of back pressure and also uniformly heating the exhaust gas.

TECHNICAL FIELD

The present invention relates to a burner and an aftertreating device of exhaust gas, more particularly, to a burner and an aftertreating device of exhaust gas which prevents loss of back pressure, enhances stability in forming flame and uniformly increases temperature of whole exhaust gas by using a flame protection tube of which one end is closed.

BACKGROUND ART

In general, since a diesel engine has better fuel-efficiency and higher output than a conventional gasoline engine, the diesel engine is used in a large-sized vehicle and also gradually applied to a small-sized vehicle. However, in the diesel engine, fuel injected into the engine is heated by a compressing motion of a piston and then burned by autoignition. Due to a non-uniform air-fuel ratio, incomplete combustion occurs in this process, and thus noxious particles (exhaust gas) are generated.

Particularly, the noxious particles mainly contain NOx, particulate matter (PM) and soot (ashes), and the noxious particles generated from diesel vehicles accounts for 40% of the total air pollution factor. Therefore, exhaust gas emissions are regulated in many countries. To this end, there has been proposed an aftertreating device of exhaust gas, which is disposed at a discharge passage so as to reduce the exhaust gas.

In a conventional aftertreating device of exhaust gas, the exhaust gas is collected by a catalytic filter and then oxidized by the catalytic filter. However, in case that a vehicle is operated in a serious traffic congestion area, i.e., a low-speed running area, it is difficult that passive regeneration is occurred by a catalyst, because a temperature of the exhaust gas is lowered. If the catalyst is not able to function as normal, output power is lowered due to an increase in exhaust back pressure, and fuel consumption is also increased. If this phenomenon is continued, the engine as well as the filter may be damaged.

In order to solve the problem, there has been proposed a mixed regeneration method in which a passive regeneration method using a catalyst is combined with an active regeneration method using an electric heater, a burner, and the like.

FIG. 1 shows an aftertreating device 100 of exhaust gas using a conventional igniting means. The aftertreating device 100 of exhaust gas is disposed at a desired position of a discharge passage through which the exhaust gas generated from an engine is flowed.

The aftertreating device 100 of exhaust gas includes a catalytic filter 120 which is provided in a body 110, an exhaust gas inlet port 112 which is formed at an outer surface of the body 110, an exhaust gas outlet port 114 which is formed at one end of the body 110, and an igniting means 130 which is formed at the other end of the body 110. In the aftertreating device 100 of exhaust gas, the exhaust gas generated from the engine is introduced into the body 110 through the exhaust gas inlet port 112 and heated by flame generated by the igniting means 130, and active regeneration of exhaust gas particulates is occurred, and then passive regeneration of the particulate matters is occurred while the heated exhaust gas is passed through the catalytic filter 120. However, when the exhaust gas is passed through the catalytic filter 120, a path of the exhaust gas introduced through the exhaust gas inlet port 112 is vertically bent in the aftertreating device 100 of exhaust gas. Therefore, since the exhaust gas is not passed though the whole area of the catalytic filter 120, but passed through only a center portion thereof, the rest portions of the catalytic filter 120 do not perform its own function. Thus, it increases a burden of the catalytic filter 120, and the efficiency of reducing the exhaust gas is deteriorated, and also a life span of the catalytic filter is reduced.

Especially, the non-uniformity in heating the exhaust gas has a bad influence on the efficiency of reducing the exhaust gas.

In order to solve the problems, there has been proposed various structures in which the fuel and the exhaust gas are properly mixed so as to form the uniform temperature distribution. But the back pressure may be increased by such structures, and thus this may exert an influence on the output power of a vehicle.

Further, there is a necessity for a burner which uniformly heats the exhaust gas without interrupting the formation of the flame.

DISCLOSURE OF INVENTION Technical Problem

An embodiment of the present invention is directed to providing a burner and an aftertreating device of exhaust gas, which stably form flame without increasing internal back-pressure so as to properly heat the exhaust gas, increase a mixing degree of the exhaust gas and the flame so as to uniformly heat the exhaust gas, and increase combustion efficiency in a catalytic filter so as to efficiently reduce the exhaust gas.

Solution to Problem

To achieve the object of the present invention, the present invention provides a burner used in an aftertreating device of exhaust gas, including a body 110 which is disposed at a desired portion of a discharge tube 400 and provided with an inlet port 111 which is formed at one side of the body 110 so as to introduce the exhaust gas therethrough, and an outlet port 112 which is formed at the other side thereof so as to discharge the exhaust gas therethrough; a flame protection tube 120 which is disposed in the body 110 and of which an end adjacent to the inlet port 111 is closed; a fuel injecting means 130 which injects fuel into the flame protection tube 120; and an igniting means 140 which ignites the fuel injected from the fuel injecting means 130 in the flame protection tube 120.

Preferably, the fuel injecting means 130 injects the fuel so that the flame is formed in a direction that the exhaust gas is flowed.

Preferably, the flame protection tube 120 is fixed to the body 110 by the fuel injecting means 130 and the igniting means 140, and the body 110 further includes a dispersion plate 150 which is disposed at the outlet port 112.

Further, the present invention provides an aftertreating device 1000 of exhaust gas, which reduces the exhaust gas generated from a diesel engine 300, including a burner 100 which is disposed at a discharge tube 400 through which the exhaust gas generated from the diesel engine 300 is flowed; and a catalytic filter 200 which is disposed at a rear end of the burner 100 so as to burn organic materials or particulate matters contained in the exhaust gas.

Advantageous Effects of Invention

According to the burner and the aftertreating device of exhaust gas of the present invention, it is possible to stably form flame without increasing internal back-pressure, increase the mixing degree of the exhaust gas and the flame, thereby uniformly heating the exhaust gas, and also increase the combustion efficiency in the catalytic filter, thereby efficiently reducing the exhaust gas.

Further, in the burner and the aftertreating device of exhaust gas of the present invention, it is possible to enhance stability in forming the flame and thus uniformly increase the temperature of whole exhaust gas by using the flame protection tube of which one end is closed.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic view of a conventional aftertreating device of exhaust gas.

FIGS. 2 and 3 are a perspective view, an exploded perspective view, and a cross-sectional view of a burner in accordance with the present invention.

FIGS. 4 and 5 are other cross-sectional views of the burner in accordance with the present invention.

FIG. 6 is a view showing an example of dispersion plate of the burner in accordance with the present invention.

FIG. 7 is a schematic view of an aftertreating device of exhaust gas in accordance with the present invention.

1000: aftertreating device of exhaust gas

100: burner

110: body 111: inlet port

112: outlet port 113: coupling part

120: flame protection tube

130: fuel injecting means 131: fuel transferring part

132: nozzle

140: igniting means

150: dispersion plate 151: plate part

152: fixing part

200: catalytic filter 300: diesel engine

400: discharge tube 0: center axis

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an aftertreating deice of exhaust gas according to the present invention will be described fully with reference to the drawings.

FIGS. 2 and 3 are a perspective view, an exploded perspective view, and a cross-sectional view of a burner 100 in accordance with the present invention, FIGS. 4 and 5 are other cross-sectional views of the burner 100 in accordance with the present invention, FIG. 6 is a view showing an example of dispersion plate of the burner 100 in accordance with the present invention, and FIG. 7 is a schematic view of an aftertreating device 1000 of exhaust gas in accordance with the present invention.

A burner 100 according to the present invention includes a body 110, a flame protection tube 120, a fuel injecting means 130 and an igniting means.

The body 110 is a basic component for forming the burner 100, which forms a certain region of a discharge tube 400. A coupling part 113 is formed at both sides of the body 110 so as to be coupled with the discharge tube 400.

The body 110 is hollowed so that the exhaust gas flowed through the discharge tube 400. The body 110 includes an inlet port 111 which is formed at one side thereof so as to introduce the exhaust gas therethrough, and an outlet port 112 which is formed at the other side thereof so as to discharge the exhaust gas therethrough.

The body 110 may be formed with a mounting part (not shown) in which a sensor for measuring internal pressure or temperature is disposed.

The flame protection tube 120 is provided in the body 110 so as to function to protect flame, thereby preventing formation of the flame from being interrupted by the exhaust gas.

The flame protection tube 120 is formed into a cylindrical shape having a constant diameter so that an end of the flame protection tube 120 adjacent to the inlet port 111 is closed, thereby stably forming the flame.

In other words, one end of the flame protection tube 120 is formed to be closed, such that the fuel injecting means 130 and igniting means 140 for forming the flame are not directly contacted with the exhaust gas, thereby stably forming the flame. Herein, the exhaust gas is pre-heated while being flowed between the flame protection tube 120 and the body 110, and then got together again at a rear side of the protection tube 120, thereby uniformly heating the exhaust gas.

In the flame protection tube 120, the fuel injecting means 130 and igniting means 140 for forming the flame are provided in turn. The fuel injecting means 130 functions to inject the fuel in order to form the flame, and may be formed with a fuel transferring part 131 for transferring the fuel and a nozzle 132 for injecting the fuel. If necessary, the nozzle 132 may be formed to inject air together with the fuel.

Further, the fuel injecting means 130 injects the fuel so as to form the flame in a direction that the exhaust gas is flowed, preferably injects the fuel toward a center axis O of the flame protection tube 120 so as to stably form the flame.

FIG. 3 shows an example that the fuel injecting means 130 is provided in the flame protection tube 120 to be directed in a length direction of the body 110, and FIG. 4 shows an example that only a fuel injecting portion of the fuel injecting means 130 is provided in the flame protection tube 120 to be directed in a length direction of the body 110.

The fuel injecting means 130 may further includes various constructions in which the fuel is injected into the body 110.

The igniting means 140 functions to ignite the injected fuel.

The flame protection tube 120 is provided in the body 110 so as to be spaced apart from the body 110 in a desired distance. Herein, the flame protection tube 120 is fixed to the body 110 by the fuel injecting means 130 and the igniting means 140 which are arranged in the flame protection tube 120.

Therefore, since the burner 100 of the present invention has a simple construction, the loss of back pressure is not occurred due to smooth flowing of the exhaust gas. Further, since the burner 100 of the present invention has the flame protection tube 120, the flame is stably formed by the fuel injecting means 130 and the igniting means 140, and thus the exhaust gas is facilely heated by the above-mentioned simple construction.

As shown in FIG. 5, the burner 100 of the present invention may further include a dispersion plate 150 which is provided at the outlet port 112 of the body 110.

The dispersion plate 150 functions so that air contained in the exhaust gas is collided with the dispersion plate 150, thereby further stably forming the flame and thus enhancing the heating effect of the exhaust gas. The dispersion plate 150 includes a plate part 151 which is collided with the exhaust gas and a fixing part 152 which fixes the plate part 151.

FIG. 6 shows various kinds of dispersion plates 150, wherein FIG. 6 a shows an example that the plate part 151 is formed into a circular shape, FIG. 6 b shows an example that the plate part 151 is formed into a mesh shape having a plurality of hollowed portions. The burner 100 of the present invention may employ further various kinds of dispersion plates 150.

An aftertreating device 1000 of exhaust gas according to the present invention functions to reduce the exhaust gas generated from a diesel engine 300. The aftertreating device 1000 of exhaust gas is disposed at the discharge tube 400 through which the exhaust gas generated from the diesel engine 300 is flowed. The aftertreating device 1000 of exhaust gas includes the burner 100 and a catalytic filter 200 which is disposed at a rear end of the burner 100 so as to burn organic materials or particulate matters contained in the exhaust gas.

Since the aftertreating device 1000 of exhaust gas uses the burner 100 which increases a mixing degree of the exhaust gas and the flame in order to uniformly heat the exhaust gas, it is possible to increase the combustion efficiency of the catalytic filter 200 and thus efficiently reduce the exhaust gas.

While the present invention has been described with respect to the specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. 

1. A burner used in an aftertreating device of exhaust gas, comprising: a body which is disposed at a desired portion of a discharge tube and provided with an inlet port which is formed at one side of the body so as to introduce the exhaust gas therethrough, and an outlet port which is formed at the other side thereof so as to discharge the exhaust gas therethrough; a flame protection tube which is disposed in the body and of which an end adjacent to the inlet port is closed; a fuel injecting means which injects fuel into the flame protection tube; and an igniting means which ignites the fuel injected from the fuel injecting means in the flame protection tube.
 2. The burner of claim 1, wherein the fuel injecting means injects the fuel so that the flame is formed in a direction that the exhaust gas is flowed.
 3. The burner of claim 1, wherein the flame protection tube is fixed to the body by the fuel injecting means and the igniting means.
 4. The burner of claim 1, wherein the body further comprises a dispersion plate which is disposed at the outlet port.
 5. An aftertreating device of exhaust gas, which reduces the exhaust gas generated from a diesel engine, comprising: a burner according to claim 1, which is disposed at a discharge tube through which the exhaust gas generated from the diesel engine is flowed; and a catalytic filter which is disposed at a rear end of the burner so as to burn organic materials or particulate matters contained in the exhaust gas.
 6. An aftertreating device of exhaust gas, which reduces the exhaust gas generated from a diesel engine, comprising: a burner according to claim 2, which is disposed at a discharge tube through which the exhaust gas generated from the diesel engine is flowed; and a catalytic filter which is disposed at a rear end of the burner so as to burn organic materials or particulate matters contained in the exhaust gas.
 7. An aftertreating device of exhaust gas, which reduces the exhaust gas generated from a diesel engine, comprising: a burner according to claim 3, which is disposed at a discharge tube through which the exhaust gas generated from the diesel engine is flowed; and a catalytic filter which is disposed at a rear end of the burner so as to burn organic materials or particulate matters contained in the exhaust gas.
 8. An aftertreating device of exhaust gas, which reduces the exhaust gas generated from a diesel engine, comprising: a burner according to claim 4, which is disposed at a discharge tube through which the exhaust gas generated from the diesel engine is flowed; and a catalytic filter which is disposed at a rear end of the burner so as to burn organic materials or particulate matters contained in the exhaust gas. 